Crossword Genius

Iris lends colour to it (7)

Ross

I believe the answer is:

eyeball

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'iris' is the definition.
(thesaurus)

I cannot understand how the rest of the clue works.

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(Other definitions for eyeball that I've seen before include "Optic organ" , "Observe closely" , "" - to - " = in close confrontation" , "Look at closely" , "Ocular orb" .)

I've seen this clue in The Globe and Mail.
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